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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract:
Balanced
Cross Sections of the
Arbuckle-Ardmore Region, Southern Oklahoma:
Implications for Interpreting Strike-Slip Deformation
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The structures of the Arbuckle Mountains and Ardmore Basin have long been considered definitive examples of strike-slip deformation. These interpretations are questionable, however, because estimates of the amount of strike-slip on the main fault (the Washita Valley Fault) vary from as little as 3 miles to as much as 40 miles, and both well and seismic data show that the major faults of the area dip only 40-50°.
This paper presents a series of highly
constrained, balanced
and palinspastically
restored vertical cross sections which
show that the observed structures may be
entirely dip-slip compressional structures.
The overall structure is that of a
large scale passive duplex. The master
strike-slip "propeller" fault, which
appears to reverse its dip and sense of
throw along strike, is interpreted as the
roof and floor thrusts bounding a plunging
basement wedge. The Arbuckle
Anticline itself is interpreted as a fault-bend
fold in the hanging-wall of the roof
thrust. The apparent releasing bend in
the master strike-slip fault appears to be
a triangle zone in the footwall of the roof
thrust. The apparent positive flower
structures adjacent to the Arbuckle
Anticline are interpreted as second-order,
detached folds in the roof
sequence of the duplex. These new
interpretations suggest that many of the
structural criteria thought to be characteristic
of strike-slip structures, are in fact
characteristic of dip-slip passive duplexes
involving basement.
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